| 摘要 |
PROBLEM TO BE SOLVED: To provide a color image forming apparatus which forms a high-quality secondary transfer image by preventing a grid electrode from being soiled by toner, improving durability of the grid electrode and obtaining excellent secondary transfer performance. SOLUTION: The pre-secondary-transfer discharging means has: a scorotron charger having the grid electrode arranged to be opposed to an image carrier and a discharge electrode; a counter electrode arranged to be opposed to the grid electrode while holding the image carrier in between; a voltage applying means for applying voltage having a reverse polarity to charge with which toner to form a toner image is charged to the discharge electrode; a voltage applying means for applying voltage having the same polarity as the charge with which the toner is charged to the grid electrode; a cleaning means for cleaning the grid electrode; a control means for controlling the cleaning timing of the cleaning means; and a detection means for detecting a value of current flowing to the counter electrode. The control means controls the timing that the cleaning means cleans the grid electrode in accordance with the value of current detected by the detection means. COPYRIGHT: (C)2009,JPO&INPIT
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